The failure referes to setup_irq :
desc->chip == &no_irq_chip is true
What is irq_desc and how can I initialize it ?
setup_irq(unsigned int irq, struct irqaction *new)
{
struct irq_desc *desc = irq_desc + irq;
struct irqaction *old, **p;
const char *old_name = NULL;
unsigned long flags;
int shared = 0;
if (irq >= NR_IRQS)
return -EINVAL;
printk("desc\n");
if (desc->chip == &no_irq_chip)
return -ENOSYS;
printk("desc2\n");
2008/9/3, Daniele Bosi <d.bosi@selcomgroup.com>:
Try to set some flag into the third parameter of the request_irq()
function like:
SA_SHIRQ Interrupt is shared
SA_INTERRUPT Disable local interrupts while processing
SA_SAMPLE_RANDOM The interrupt can be used for entropy
otherwise try to use the function install_irq_handler()
bye Daniele
Sébastien Chrétien ha scritto:
> Hello,
>
> I am trying to register a function writh IRQ :
>
> static irqreturn_t uart_test (int irq , void *dev_id)
> {
> printk("/!\\ Interruption : tx_empty\n");
> return IRQ_HANDLED;
> }
>
> req=request_irq(0x18,uart_test,NULL,"uart_test",NULL);
> printk("Initialisation IRQ UART : %d \n", req);
>
> When I boot linux ppc, the req value is -38.
> What is wrong ?
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Daniele Bosi
*DIGITEK S.p.A.*
Via L. Romagnoli 24,
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Modena (MO), Italy
*Tel*: +39-(0)53556942 Fax. +39-(0)53554550
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*Mail to:* d.bosi@selcomgroup.com <mailto:d.bosi@selcomgroup.com>